1# SPDX-License-Identifier: GPL-2.0-only 2 3# Unlike the kernel space, exported headers are written in standard C. 4# - Forbid C++ style comments 5# - Use '__inline__', '__asm__' instead of 'inline', 'asm' 6# 7# -std=c90 (equivalent to -ansi) catches the violation of those. 8# We cannot go as far as adding -Wpedantic since it emits too many warnings. 9UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration 10 11override c_flags = $(UAPI_CFLAGS) -Wp,-MD,$(depfile) -I$(objtree)/usr/include 12 13# The following are excluded for now because they fail to build. 14# 15# Do not add a new header to the blacklist without legitimate reason. 16# Please consider to fix the header first. 17# 18# Sorted alphabetically. 19header-test- += asm/msgbuf.h 20header-test- += asm/sembuf.h 21header-test- += asm/shmbuf.h 22header-test- += asm/signal.h 23header-test- += asm/ucontext.h 24header-test- += drm/vmwgfx_drm.h 25header-test- += linux/am437x-vpfe.h 26header-test- += linux/android/binder.h 27header-test- += linux/android/binderfs.h 28header-test- += linux/coda.h 29header-test- += linux/elfcore.h 30header-test- += linux/errqueue.h 31header-test- += linux/fsmap.h 32header-test- += linux/hdlc/ioctl.h 33header-test- += linux/ivtv.h 34header-test- += linux/kexec.h 35header-test- += linux/matroxfb.h 36header-test- += linux/nfc.h 37header-test- += linux/omap3isp.h 38header-test- += linux/omapfb.h 39header-test- += linux/patchkey.h 40header-test- += linux/phonet.h 41header-test- += linux/reiserfs_xattr.h 42header-test- += linux/sctp.h 43header-test- += linux/signal.h 44header-test- += linux/sysctl.h 45header-test- += linux/usb/audio.h 46header-test- += linux/v4l2-mediabus.h 47header-test- += linux/v4l2-subdev.h 48header-test- += linux/videodev2.h 49header-test- += linux/vm_sockets.h 50header-test- += sound/asequencer.h 51header-test- += sound/asoc.h 52header-test- += sound/asound.h 53header-test- += sound/compress_offload.h 54header-test- += sound/emu10k1.h 55header-test- += sound/sfnt_info.h 56header-test- += xen/evtchn.h 57header-test- += xen/gntdev.h 58header-test- += xen/privcmd.h 59 60# More headers are broken in some architectures 61 62ifeq ($(SRCARCH),arc) 63header-test- += linux/bpf_perf_event.h 64endif 65 66ifeq ($(SRCARCH),ia64) 67header-test- += asm/setup.h 68header-test- += asm/sigcontext.h 69header-test- += asm/perfmon.h 70header-test- += asm/perfmon_default_smpl.h 71header-test- += linux/if_bonding.h 72endif 73 74ifeq ($(SRCARCH),mips) 75header-test- += asm/stat.h 76endif 77 78ifeq ($(SRCARCH),powerpc) 79header-test- += asm/stat.h 80header-test- += linux/bpf_perf_event.h 81endif 82 83ifeq ($(SRCARCH),riscv) 84header-test- += linux/bpf_perf_event.h 85endif 86 87ifeq ($(SRCARCH),sparc) 88header-test- += asm/stat.h 89header-test- += asm/uctx.h 90header-test- += asm/fbio.h 91endif 92 93# asm-generic/*.h is used by asm/*.h, and should not be included directly 94header-test- += asm-generic/% 95 96extra-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h')) 97 98quiet_cmd_hdrtest = HDRTEST $< 99 cmd_hdrtest = \ 100 $(CC) $(c_flags) -S -o /dev/null -x c /dev/null \ 101 $(if $(filter-out $(header-test-), $*.h), -include $<); \ 102 $(PERL) $(srctree)/scripts/headers_check.pl $(obj) $(SRCARCH) $<; \ 103 touch $@ 104 105$(obj)/%.hdrtest: $(obj)/%.h FORCE 106 $(call if_changed_dep,hdrtest) 107 108clean-files += $(filter-out Makefile, $(notdir $(wildcard $(obj)/*))) 109